At the end of last year I took my '05 FLHRSI to stage I using the SE air cleaner and performance slip-ons. I had a huge amount of backfiring with the Stage I map. Dealer said they were having problems with the '05 touring bikes doing that w/ the Stage I so they put the map on for a 1550 motor. Bike seems to run okay now, but after reading all of these SERT posts I'm beginning to wonder how far off it is now, and if it is too rich. Thoughts, suggestions? I'm leaning towards getting a SERT, mapping back to Stage I and trying Mega's adjustments. Thanks!